GB928172A - Improvements relating to telephone exchange systems - Google Patents

Improvements relating to telephone exchange systems

Info

Publication number
GB928172A
GB928172A GB885361A GB885361A GB928172A GB 928172 A GB928172 A GB 928172A GB 885361 A GB885361 A GB 885361A GB 885361 A GB885361 A GB 885361A GB 928172 A GB928172 A GB 928172A
Authority
GB
United Kingdom
Prior art keywords
connection
exchange systems
switching
transmission path
telephone exchange
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB885361A
Inventor
Bernard Drake
Sydney Francis Smith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB885361A priority Critical patent/GB928172A/en
Priority to US17395262 priority patent/US3229040A/en
Publication of GB928172A publication Critical patent/GB928172A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/60—Auxiliary means structurally associated with the switch for cleaning or lubricating contact-making surfaces
    • H01H1/605—Cleaning of contact-making surfaces by relatively high voltage pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Dc-Dc Converters (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

928,172. Automatic exchange systems. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Feb. 2, 1962 [March 10, 1961], No. 8853/61. Drawings to Specification. Class 40 (4). Contact-wetting and/or pad-switching potentials are applied to a switching connection in a transmission path at an exchange but are insufficient to ensure the breakdown of highresistance films existing on any of the contacts of the connection, means being provided for producing a potential surge through the connection in order to effect breakdown of any such films. As described, the surge is produced by means of a capacitor charge/discharge circuit comprising two capacitors connected to different potentials and to centre tappings on two transformer windings connected across the transmission path on either side of the switching connection. Specification 926,684 is referred to.
GB885361A 1961-03-10 1961-03-10 Improvements relating to telephone exchange systems Expired GB928172A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB885361A GB928172A (en) 1961-03-10 1961-03-10 Improvements relating to telephone exchange systems
US17395262 US3229040A (en) 1961-03-10 1962-02-19 Telephone exchange systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB885361A GB928172A (en) 1961-03-10 1961-03-10 Improvements relating to telephone exchange systems

Publications (1)

Publication Number Publication Date
GB928172A true GB928172A (en) 1963-06-06

Family

ID=9860507

Family Applications (1)

Application Number Title Priority Date Filing Date
GB885361A Expired GB928172A (en) 1961-03-10 1961-03-10 Improvements relating to telephone exchange systems

Country Status (2)

Country Link
US (1) US3229040A (en)
GB (1) GB928172A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3407310A (en) * 1965-10-07 1968-10-22 Teletype Corp Contact cleaning circuit
US3407311A (en) * 1965-12-13 1968-10-22 Teletype Corp Contact cleaning circuit
JP2539915B2 (en) * 1989-06-08 1996-10-02 富士通株式会社 Overvoltage detection control circuit for ringing signal device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1250152A (en) * 1916-04-05 1917-12-18 Carl William Eisenmann Automatic switch.
US1785818A (en) * 1929-01-09 1930-12-23 American Telephone & Telegraph Telephone system
US2647165A (en) * 1948-09-13 1953-07-28 Hartford Nat Bank & Trust Co Apparatus for breaking contact resistance in a marker-controlled selector

Also Published As

Publication number Publication date
US3229040A (en) 1966-01-11

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